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RS232 Protocol
1. Introduction
This document describes the hardware interface spec and software protocols of RS232 interface
communication between Viewsonic Commercial Display and PC or other control unit with RS232
protocol.
The protocol divide into three sections:
• Set-Function
• Get-Function
• Remote control pass-through mode
※ In below document, "PC" will represents all the control units that can sent or receive the
RS232 protocol command.
2. Description
2.1 Hardware specification
Viewsonic LCD communication port in the rear side
(1) Connector type: DSUB 9 Pin Male
(2) Pin Assignment
Male DSUB 9Pin
(outside view)
1 2 3 4 5
6 7 8 9
2.2 Communication Setting
• Baud Rate Select: 9600bps (fixed)
• Data bits: 8bits (fixed)
• Parity: None (fixed)
• Stop Bits: 1 (fixed)
2.3 Command Message Reference
PC sends to Monitor command packet followed by "CR". Every time PC sends control command to
the Monitor, the Monitor shall response as follows:
1. If the message is receives correctly it will send "+" (02Bh) followed by "CR" (00Dh)
2. If the message is receives incorrectly it will send "-" (02Dh) followed by "CR" (00Dh)
ViewSonic
Pin #
Signal
1
NC
2
RXD
3
TXD
4
NC
5
GND
6
NC
7
NC
8
NC
9
NC
frame
GND
* Use of crossover (null modem) cable required for use
with PC.
37
Remark
Input to LCD Monitor
Output from LCD Monitor
VT3205LED
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